/**
 *@file hello.cpp
 *@author Ngoo Linghui <linghui01009@zju.edu.cn>
 *@date Tue Sep 21 11:44:48 2021
 *
 *@brief A demo program for teaching
 *
 *
 */

#include <iostream>

/**
 *main function.
 *
 *@param argc number of shell parameters.
 *@param argv strings for all parameters.
 *
 *@return system signals.
 */
int main (int argc, char* argv[])
{
  ///Just a demo.
  std::cout << "Hello World!" << std::endl;
  return 0;
}
;
